Detonator



'into the charge therein.

Sept. we;

na'connin, or en. aonnswoon, Lennon, nnenann.

BETONATOR.

application filed March 223, 1925, serial No. 17,650, and in GreatBritain February 7, 1925.

TIT

conveyance by train, road or the like. For

instance, the invention is primarily applicable to detonators wherein adeto-nator charge of a suitable composition, such, for instance, astetranitromethylaniline, 1S pressed into a tube or the like, andassociated with a priming composition, such as fulminate of mercury, orpercussion cap or amorce. lln this case the detonatonis, according tothis invention, characterized in that the priming composition orequivalent is kept away from the detonator composition loaded in aseparate member until the time of actual use. ing charge (e. g.dynamite, blasting gelatine or the like) into which the detonator isinserted may be exploded direct from. the primer without the aid of adetonating composition such as tetryl (tetranitromethylaniline), thepresent invention embraces the attainment of the object by theemployment of a detonator or blasting-fuse wherein the primingcomposition, such as fulminate of mercury, 01' percussion cap or amorcc,is kept away from the blasting charge-wh ch, in use, forms a part of theblasting-fuseuntil the actual moment of use.

in attaining the object with this second form (omitting tetryl or thelike? the lower end of the pencil-like tube usua ly containing thetetryl is formed as an open-ended empty tube which can be filled on thespot with blasting ,elatine or the like either from the cartridge ag orby plunging the same The said tube can be a separate member attachableto the primer tube, or can be integrally in one therewith, in any casethere being provided a detonator or blasting-fuse in which the primercomposition or equivalent is contained in a member entirely separatefrom the detonator or blasting composition until it is required to bringthem together.

As in certain cases the blast-.

Broadly, therefore, the invention may be summarized as a detonator forblasting cartridges or the like, characterized in that it is constructedwith components whereby the primer and detonating (or blasting) combpositions respectivelv may be kept apart.

The advantage of being able to keep apart primer and detonator-proper bythis employment of a pair of safely handled components will be apparent.For example, a box or container for detonators according to thisinvention could be constructed with two separate compartments, one anest of, say, fifty recesses for the primer tubes, and the other havingfifty recesses for the detomater-containing tubes, each collection ofcomponents being safely segregated. The lid of such a container could beso constructed that only one nest of recesses was accessible 7 at theone time, thereb further assuring safety, Or, in the secon species, theempty tubes to be filled on the spot with detonator or blastingcomposition could be packed with the primers.

From the foregoing, a general understanding of the invention will havebeen obtained, and in order that the said invention shall be more clearlunderstood reference is directed to the allowing description andaccompanying sheet of drawings, wherein Figure 1 shows, in sectionalelevation, one form of a detonator, including a tetryl or equivalentcharge, according to this invention with the components detached.

Figure 2 is an outside elevation of the form shown in Figure 1, with thecomponents assembled ready for use; and,

Figure 3 is a sectional elevation of a modified form, also with thecomponents assembled for use.

Figure 4 shows, in sectional elevation, a blasting cartridge to which isapplied a dotonator or blasting-fuse accordin to the invention, whereintetryl or eqmvalent is omitted.

Figure 5 is a sectional elevation of a slight ly difierent form ofdetonator.

Figure 6 shows another form of the detonator, comprising a pair ofattachable components, tctryl being omitted.

Figure 7 shows, again in sectional elevaform of an elongated metalcylinder f, closed at one end, and adapted to contain the pressed-indetonator composition g, having a space or chamber 72, above thecomposition to receive the primer tube. The primer tube a and thedetonator f have a pin and slot connection the detonator 7 having abayonet the tube a.

slot 2' at its upper end on either side to receive laterally projectingpins z" carried by The tube a is of smaller diameter than the tube 7 fortelescopic engagement therewith and the frictional fit between these twotubes is sufiicient for the purpose of assembly but a positivedetachable bayonet joint lock may be supplied if found desirable.

In the form shown in Fig. 3 the primer tube a is the same as the tube ain Figs. 1 and 2 except that its connection with the detonator tube f isby means of an internal thread on said tube f and an exteriorly threadedreduced end of the base 6 the threaded end being marked j. The lettersused in this form of the invention are the same as those in Figs. 1 and2 except that the exponent 1 is employed.

In Figs. 1, 2 and 3 the detonator tubes are closed at their lower endsand open at their upper ends while in the form shown in Figs. 4- and 5the detonator tubes f are made integral with the priming tubes a and areopen at their lower ends. This tube f thus remains empty until fittedinto the cartrid e Ia shown in Fig. 4 when it becomes filled orsubstantially filled with the blasting gelatine or similar compositionshown at Z. In this form of the invention the primer element 1) c and dis located at the junction of tubes a and F.

In Fig. 6 the structure is similar to that shown in'Fig. land 2 exceptthat the detonator tube f is open at its lower end instead of beingclosed and it may be either provided with a positive or detachable locksuch as the bayonet joint shown or the frictional fit may be sufficientfor the purpose of assembly. The numerals used in this form are the sameas in the other figures 7 except that the exponent 3 is employed.

The form shown in Fig. 7 is similar to that shown in Fig. 3 except thatthe detonator tube 7" is open at its lower end instead of being closedotherwise the structure is the same as that shown in Fig. 3. In Fig. 7the reference numerals employed are the same as in the other figuresexcept that the exponent 4 is used in connection with them.

In the form shown in Fig. 8 the primer tube a has its interior graduallytapered toward its lower end providing thickened walls b at said lowerend which operates in the same manner as the base 6, b 0 If and b of theother figures the thin dividing web employed in the other forms beingomitted in this form of thezinvention and the safety fuse e is locateddirectly over the primer or fulminate d.

In Fig. 9 the primer tube a, is provided at its lower 0 en end with asleeve m located on the interior of the tube and forms the chamber orseat for the fulminate d which has located above it the safety fuse 6 Byemploying the thickened base I) and the tubular member f which extendsinto the charge It", the initial explosive and igniting blast generatedat cl is directed longitudinally to the center of the charge is, thethickened base preventing lateral shattering of the fulminate primerthereby directing the primer explosion longitudinally.

1. A detonator or blasting fuse comprising a fulminate primer tubehaving a thickened base, with an axial recess opening through the end ofthe tube and adapted to contain a fulminate priming composition, and adetonator tube adapted to be filled with a detonator composition, theprimed end of the primer tube being connected with the detonator tube.

2. A detonator or blasting fuse including 105 a fulminate primer tubehaving a thickened base with an axial recess openingthrough the end ofthe tube to contain a fulminate priming composition whereby theexplosion is directed longitudinally rela 110 tivelyto said tube.

3. A detonator or blasting fuse comprising a fuhninate primer tubehaving an open end and a thickened base closed end, said base having anaxial recess opening through the surface of the base and adapted tocontain a fulminate priming composition, a closed end detonator tubepartially filled with detonator composition above the closed end andopen at the other end, the primed end of the primer tube detachablyfitting the space left in the open end of the detonator tube.

4. A blasting fuse comprising a tubular member in the base of which islocated a fulminate priming composition or equivalent, and a tubularmember with an open end and into which the blasting composition or thelike can be readily filled on the spot, the base of said first mentionedtubu- 1% and a detonator or blasting tube adapted te be filled with adetonator composition the primed end of the primer tube being cognectedwith the detonator or blasting to e.

In testimony whereof I have aflixed my signature hereto this 9th day ofMarch 1925.

DAVID Cosme.

